Improved weft stock detector for weft feeders

Abstract

A detector exerts to a weft feed machine provided with a fixing drum (12) with a yarn coil winding on to form a weft storage (RT). Three detecting arms (22, 24, 26) hinge on the side of the drum coiling each axes (28, 30, 32) and lean on the drum by each contacting end (24a), so as to swing between a movable take-up position and a lower lay-up position relative to existence / loss of the coil on the drum. A photovoltaic element (42) setting to the movement of the detecting arm includes a luminescent diode (47) and a photodiode (50), the luminescent diode generates a photon stream through a lathy slot (48) extending racially, the photodiode is in the front of the slot (48). Each detecting arm has a baffle (52) which can be inserted between the luminescent diode and the photodiode and be defined by a straight line edge (54) in the front, when the detecting arm is in the lay-up position, the straight line edge aligns with the outside edge of the slot, so as to hide the slot.

Description

technical field [0001] The present invention relates to an improved weft storage detector for a weft feeding machine. Background technique [0002] Weft thread feeders for weaving machines are known, comprising a fixed drum on which a motorized swivel arm winds a plurality of yarn coils to form a weft thread store. Once demanded by the loom, the coil of yarn is unwound from the drum, passed through a guide eyelet, and fed to the loom. [0003] For weft thread feeding machines of the above type, the weft thread storage on the drum is controlled by a weft thread storage detector, which usually includes two oscillating detection arms, which are arranged at opposite ends of the drum and for example by The drum is biased against the drum by springs and / or by gravity, and a third oscillating detection arm is arranged in an intermediate position, the third oscillating detection arm having the effect of detecting any breakage of the yarn. Each detection arm is pivotable between a ...

AI Technical Summary

Problems solved by technology

[0004] The above types of detectors have a disadvantage: they are generally inaccurate when detecting fine yarns, since in this case the movement of the detection arm from the active position to the rest position (and vice versa) is so small that the photocell cannot detect arrive

Therefore, these detection failures affect the reliability of the weft storage detector

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